I'm using the spartan transfer switch from Wills videos to keep my batteries from going to low. The problem is that whenever a large load is put on my inverter it drops the voltage below my cutoff point and switches to grid power. As soon as the load goes off the voltage goes back up. How do I know how low to set the cutoff voltage?
Spartan automatic transfer switch
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Archetype-IS
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You can monitor with the meter for min and max on the battery when the high load kicks on so you have an idea what that number is. Once you know that, you can set the minimum low voltage for the cut over.
The ATS switching to high loads actually prolong the the battery or the inverter's life.
The ATS switching to high loads actually prolong the the battery or the inverter's life.
So would it work to figure out what percentage the voltage is dropping and then set the cutoff for that percentage lower than what I want the real voltage to be? Hope that makes sense.
Archetype-IS
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Not sure what that high load is. Is it a critical load? If the load is too high it will kill the battery faster with that high of current discharge. What battery type are you using and inverter? The ATS, best to get a reading on the low voltage draw when the high load runs before it kicks to grid power and see what that is. The ATS does not have a state of charge for the battery detection. That will require a battery monitor that can kick off a relay to do the low voltage to the ATS for the cut over to the grid side.
Archetype-IS
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Inverter brand? Have you looked at what the surge wattage of the inverter is? Is it HF or LF type?
Anyway, the answer is the windows AC units start up amp draw is a lot for a 1200BTU unit. My guess it is at 120v/10amp efficient. Not sure what voltage your running the inverter at 12/24/48. Maybe get a soft starter for it and see if is helps the high spike on the battery?
Anyway, the answer is the windows AC units start up amp draw is a lot for a 1200BTU unit. My guess it is at 120v/10amp efficient. Not sure what voltage your running the inverter at 12/24/48. Maybe get a soft starter for it and see if is helps the high spike on the battery?
I didn't properly get this (quite new to the subject) Can you explain?
Archetype-IS
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Here is the Moes/Spartan ATS(Auto Transfer Switch) video that Will reviewed and explained it in better details. The OP was asking why the high load draw, in this case the AC 12K BTU window type air conditioner would caused the battery voltage to drop and caused the ATS relay to switch over to the grid power. We were just speculating and try to see if it could be set to a low voltage drop for the auto switch over to grid power so it won't switch to grid as often. Also, assuming if the ATS constantly toggle between battery inverter, this will prolong the battery or inverter, because those in-rush current draw will cause issues for them later down the line. So, the ATS could potentially saving those components by using the grid in high load when the AC compressor kicks in. Hope that make sense.
Archetype-IS
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It is the same clone if you look at it.
Definitely, I just hadn't seen the Spartan name in the manual or the AMZN listing. I always saw the MOES name.
I just wanted to be sure it was the same unit that the OP was referring to.
Amazon.com: MOES Dual Power Controller 50A 5500 Watt Automatic Transfer Switch for Off Grid Solar Wind System ATS DC 12V 24V 48V AC 110V 220V: Garden & Outdoor
Amazon.com: MOES Dual Power Controller 50A 5500 Watt Automatic Transfer Switch for Off Grid Solar Wind System ATS DC 12V 24V 48V AC 110V 220V: Garden & Outdoor
www.amazon.com
I just wanted to be sure it was the same unit that the OP was referring to.
Archetype-IS
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Here is the Spartan model. The OP could confirm. Works the same as Moes. Clone of it.
Another potential solution option for you. You have already been provided with the simplest solution, another perspective is that if you increase your battery capacity, the battery bank's voltage won't dip so low.
Assuming you have a lead-acid battery, review the puekert effect ... basically, the bigger the current draw, the lower your effective capacity. Also, deep cycle (aka leisure) batteries are not designed for massive currents, they lack the internal surface area, so they will heat up more quickly, damaging the active material more rapidly, thereby aging the battery more quickly.
Alright! Thanks for the explanation
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